The seventh chakra, Sahaswara, is referred to as the thousand-petal lotus chakra. This is the top chakra of the seven and located at the crown of the head. Sahaswara is our source of enlightenment and spiritual connection to all that is. It is a connection to our higher selves, to every being on the planet, and ultimately the divine energy that creates everything in the universe. (source)
Some crystals that we carry that my help you balance your Crown Chakra are Amethyst, Pearl, Citrine, and Lepidolite.